Approximately how long does it take to lock down carbon absorbed via fast cycles into stable, long-term chemical forms?

Answer

$10,000$ to $30,000$ years

While surface processes like photosynthesis draw down carbon quickly, the process required to sequester that carbon into stable, long-term chemical reservoirs takes ten thousand to thirty thousand years.

Approximately how long does it take to lock down carbon absorbed via fast cycles into stable, long-term chemical forms?
oceanatmospherecyclecarbondriver